修复飞书渠道会话创建时机：执行斜杠命令前先确保会话存在

在 Feishu 收到斜杠命令时，先通过 CreateDialog 创建会话，
再执行实际的命令。这样 /dump 等命令就能正确获取对话历史。

src/channels/feishu.rs

@@ -2017,16 +2017,36 @@ impl Channel for FeishuChannel {
         // Check for slash command
         if let Some((cmd_name, cmd_args)) = parse_slash_command(&msg.content) {
             tracing::info!(cmd = %cmd_name, "Feishu slash command detected");
+
+            // For slash commands, we need to ensure a session exists first
+            // Get or create session via control plane
             let (reply_tx, mut reply_rx) = mpsc::channel(1);
+            bus.publish_control(crate::bus::ControlMessage {
+                op: SessionCommand::CreateDialog {
+                    channel: msg.channel.clone(),
+                    chat_id: msg.chat_id.clone(),
+                    title: None,
+                },
+                reply_tx,
+            }).await?;
+
+            // Wait for session creation
+            let session_id = match reply_rx.recv().await {
+                Some(Ok(SessionEvent::DialogCreated { session_id, .. })) => Some(session_id),
+                _ => None,
+            };
+
+            // Now execute the slash command with the session
+            let (cmd_reply_tx, mut cmd_reply_rx) = mpsc::channel(1);
             bus.publish_control(crate::bus::ControlMessage {
                 op: SessionCommand::ExecuteSlashCommand {
                     command: cmd_name.to_string(),
                     args: if cmd_args.is_empty() { None } else { Some(cmd_args.to_string()) },
                     channel: msg.channel.clone(),
                     chat_id: msg.chat_id.clone(),
-                    current_session_id: None,
+                    current_session_id: session_id,
                 },
-                reply_tx,
+                reply_tx: cmd_reply_tx,
             }).await?;
 
             // Handle response

src/session/session.rs

@@ -370,14 +370,8 @@ impl SessionManager {
                 }
             }
             "info" => {
-                let sid = if let Some(s) = current_session_id {
+                if let Some(sid) = current_session_id {
-                    s.clone()
+                    let session = self.get_or_create_session(sid).await?;
-                } else {
-                    // Create a new session if none exists (e.g., Feishu first message)
-                    let (new_id, _) = self.create_session(channel, chat_id, None).await?;
-                    new_id
-                };
-                let session = self.get_or_create_session(&sid).await?;
                     let session_guard = session.lock().await;
                     let message_count = session_guard.get_history().len();
                     let session_id_str = session_guard.session_id();
@@ -385,19 +379,19 @@ impl SessionManager {
                         "Session ID: {}\nMessage count: {}",
                         session_id_str, message_count
                     )))
+                } else {
+                    Ok((None, "No active session.".to_string()))
+                }
             }
             "dump" => {
-                let sid = if let Some(s) = current_session_id {
+                if let Some(sid) = current_session_id {
-                    s.clone()
+                    let session = self.get_or_create_session(sid).await?;
-                } else {
-                    // Create a new session if none exists (e.g., Feishu first message)
-                    let (new_id, _) = self.create_session(channel, chat_id, None).await?;
-                    new_id
-                };
-                let session = self.get_or_create_session(&sid).await?;
                     let session_guard = session.lock().await;
                     let md = session_guard.dump_as_markdown();
                     Ok((None, md))
+                } else {
+                    Ok((None, "No active session.".to_string()))
+                }
             }
             _ => Err(AgentError::Other(format!("Command not implemented: {}", cmd.name))),
         }